Hi Chris,

I followed your code and its working fine.. but the problem i am facing is when i check the header to true , all the rows are checked and vice versa.. but once i check the header true and manually uncheck any of the rows, it wont change the header to uncheck,

Please help me ... thanks in advance

Since you've turned off the automatic synchronization in order to produce your own customized synchronization, you will need to handle synchronizing the header checkbox to match the cell values.

Assuming you want the header checkbox to be unchecked (except when all cell in the column are checked), you will want to code similar to the following in the CellChanged or AfterCellUpdate event handler:

    Private Sub grd_CellChange(ByVal sender As System.Object, ByVal e As Infragistics.Win.UltraWinGrid.CellEventArgs) Handles grd.CellChange
        Dim originalInCellChange = Me.inCellChange
        Me.inCellChange = True
        Try
            Dim cell As UltraGridCell = e.Cell
            Dim column As UltraGridColumn = cell.Column
            Dim rows As RowsCollection = cell.Row.ParentCollection
            Dim newCellValue As Boolean = cell.EditorResolved.Value

            Dim currentHeaderCheckState As CheckState = column.GetHeaderCheckedState(rows)
            If newCellValue Then
                If Not (currentHeaderCheckState = CheckState.Checked) Then
                    ' the header is not checked but the new cell value is true
                    ' so we need to loop through all the rows (assuming that we want to synchronize based on the rows collection)
                    ' to determine if we need to check the header
                    Dim shouldCheckHeader As Boolean = True
                    For Each row In rows
                        Dim cellInRow = row.Cells(column)
                        If cell IsNot cellInRow AndAlso cellInRow.Value = False Then
                            shouldCheckHeader = False
                            Exit For
                        End If
                    Next
                    If (shouldCheckHeader) Then
                        column.SetHeaderCheckedState(rows, True)
                    End If
                End If
            ElseIf currentHeaderCheckState = CheckState.Checked Then
                ' the header is checked but the new cell value is false,
                ' so turn off the header
                column.SetHeaderCheckedState(rows, False)
            End If
        Finally
            Me.inCellChange = originalInCellChange
        End Try
    End Sub

Additionally, you will want to add a recursion flag at the start of the AfterHeaderCheckStateChanged event handler, to prevent the SetHeaderCheckedState() in CellChanged from triggering all the cell to be set to False/Unchecked.

        If (Me.inCellChange) Then
            Return
        End If

Let me know if you require any further assistance with this.

Thanks,

Chris

For first click on header checkbox it is not working.